Houston-based Occidental Petroleum Corp. on May 5, 2015 named Vicki Hollub to succeed retiring President and CEO Stephen Chazen, making her the first female president of a major oil and gas firm. See the other faces behind Houston's biggest companies. less

Houston-based Occidental Petroleum Corp. on May 5, 2015 named Vicki Hollub to succeed retiring President and CEO Stephen Chazen, making her the first female president of a major oil and gas firm. See the other ... more